The vast majority of animals are ____

Autoimmune diseases are more common in men than in women.

True False

One of the most important branch points in the evolution of animals and their nervous systems was the appearance of

A) radial symmetry. B) bilateral symmetry. C) the spinal column. D) specialized cells for transmitting signals.

How many hydrogen bonds are there between cytosine and guanine?

a. none b. one c. two d. three

In Morgan's testcross of a gray-bodied, long-winged heterozygous female Drosophila with a homozygous recessive black-bodied, vestigial-winged male, the following offspring were obtained: 965 gray body, long wing; 944 black body, vestigial wing; 206 gray body, vestigial wing; 185 black body, long wing. Focusing only on the recombinant classes (gray body, vestigial wing and black body, long wing), the numbers of offspring of each type are similar (206 and 185). What accounts for the similar number of offspring of each recombinant phenotype?